Sewing machine presser-foot



March 14, 1933. J. D. KARLE 1,901,752

SEWING MACHINE PRESSER' FOOT Filed Nov. 14, 1951 gwue'ntoz Patented Mar.14, 1933 UNITED STATES PATENT OFFICE 'JOHN D. KARLE, OF ROSELLE PARK,NEW JERSEY, ASSIG-NOR TO THE SINGER MANU- FACTURING COMPANY, OFELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY SEWING MACHINEPRESSER-FOOT Application filed November 14, 1931. Serial No. 575,022. 3

This invention relates to sewing machine presser-feet and has for itsobjects: to provide an improved presser-foot capable of limitedlengthwise and sidewise rocking movements with respect to the line ofseamformation, so that it will accommodate itself to any irregularitiesin the work: to construct a presser-foot which offers a minimum ofresistance to the rocking move- 1 ments; and to provide a presser-footthat is simple in construction and may be assembled and manufactured atlittle expense.

With the above and other objects in view, as will hereinafter appear,the invention consists in the devices, combinations, and arrangements ofparts hereinafter set forth and illustrated in the accompanying drawingof a preferred embodiment of the invention, from WhlChtllG severalfeatures of the invention and the advantages attained thereby will bereadily understood by those skilled in the art.

In the accompanying drawing Figure 1 is a left side elevation of apresserfoot embodying the invention.

Figure 2 is a top plan view, partly in section, of the presser-foot.

Figure 3 is a. section taken along the line 33 of Figure 2.

Figure 4c is a section taken along the line 44 of Figure 2.

Figure 5 is a disassembled perspective view of the presser-foot.

In the embodiment of this invention selected for illustration, 1 is theusual springpressed resser-bar to which is secured by the screw 2 theupper part of the shank 3 of the presser-foot. The shank 3 is formedfrom sheet-metal and has an offset depend- 49 ing portion 4 terminatingwith two oppositely projecting horizontal lugs 5 and 6. The lugs 5 and 6are at right angles to the depending portion and are transverse to theline of scam formation, when the presserfoot is in operative position.The lugs 5 and 6 are so formed with respect to the lower part of thedepending portion 4, that the lower edge of the lugs and lower part formthe arc of a circle; this are being transverse to the line ofseam-formation and convex in form, and having its axis of curvature inthe direction of and parallel to the line of scamformation as shown at'7 in Figures 4 and 5.

In the direction of the line of seam-formait tion the lower part of thedepending portion l and lugs 5 and 6 are rounded to form the arc of acircle, asshown at 8 in Figures 1,

3 and 5. The contour or shape of the lower part of the depending portionl and lugs 5 and 6, may best be described as a segment of an ellipsoid.

The usual bifurcated sole-plate Qhaving a needle-aperture 10 fortheneedle 10 is provided with a centrally located transverse -i. channel11. The channel is concave both transversely of and in the direction ofits length, so that it forms a suitable bearing for the lower part ofthe shank and the lugs 5 and 6. It will be observed in Figures 3 and 4that the curvatures of the walls of the concave channel 11 are greaterthan those of the respective portions of the convex lugs 5 and 6 and thelower part of the shank 1 adjacent thereto. This construction pera mitsa limited lengthwise and sidewise rocking movement of the sole-platewith respect to its length or the line of seam-formation, so that itwill exert a uniform pressure upon the work over the entire area of thefeed-dog 16 under substantially all conditions.

A retaining plate 12 provided with fingers 13 and an upstanding lug 14;is secured to the heel of the sole-plate by any suitable means, hereshown as a rivet 15. The fingers 13 of the retaining plate 12 extendover the lugs 5 and 6 thereby holding the depending portion 4 of theshank in the channel 11 of the sole-plate, it being understood thatthere is a certain amount a of clearance between the fingers 13 and thelugs 5 and 6 necessary to permit the rocking movements described. Thisconstruction ofiers the minimum of resistance to the movement of thesole-plate on the shank.

It will be observed in Figure that the shoulders 17 and 18 act as stopsto limit the movement of the sole-piece 9 on the shank 4:. Theupstanding lug 14 on the retaining plate 12 acts as a supplemental stopfor the sole-plate. This lug or stop 14 prevents the toe of thesole-plate from rocking downward beyond a certain limit when thepresser-foot is in inoperative or raised position; the greater weightbeing in the toe-portion of the sole-plate.

From the foregoing description considered in connection with theaccompanying drawing, the construction, manner of eration, and severaladvantages of my improved presser-foot will be clearly and fullyunderstood. It is apparent that such a device has a wide variety ofuses, and it will be understood that the form, constructionandarrangement of the several elements employed may be varied. Therefore,the privilege is reserved of resorting to all such legitimate changestherein as may be fairly embodied within the spirit and scope of theappended claims.

Having thus set forth the nature of the invention, what I claim hereinis 1. A sewing machine presser-foot comprising a shank, a memberdepending from said shank having its lower end curved both transverselyof and in the direction of the line of seam-formation, a sole-plate, andmeans for retaining said sole-plate on said depending member.

2. A sewing machine resser-foot comprising a shank having a dependingportion, the lower end of said depending portion terminating in asegmental sole-piece engaging portion having its axis of curvatureparallel to the line of seam-formation and its edges rounded, asole-plate, andmeans for pivotally connecting said depending portion tosaid sole-plate for lengthwise and sidewise rocking movement withrespect to the line of seam-formation.

3. A sewing machine presser-foot comprising a shank and a sole-piececonstructed in separate parts, said parts being provided withcomplementary seats at least one of which is curved both transversely ofand in the direction of the line of seam-formation, and means forsecuring said sole-piece to said shank for sidewise and lengthwiserocking movement with respect to the line of seam-formation.

4. A sewing machine presser-foot comprising a shank, a member carried bysaid shank, the lower end of said member having substantially the shapeof a segment of an ellipsoid, a sole-plate, and means for pivotallyconnecting said member to said soleplate.

5. A presser-foot having a sole-plate formed in its upper surface with atransverse channel, a shank-member having a depending portion receivedin said channel, the proximate surfaces of said depending portion andchannel being cut away to provide clearance spaces permitting a limitedrolling action of the sole-plate upon and 7 relative to said shank bothtransversely and

